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Consolidated Statement Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ 79,390 $ (29,695) $ (15,209)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation, depletion and amortization 74,981 37,832 16,670
Impairment of oil and gas properties 3,610 11,967 6,233
Loss (gain) on sale of properties 207   (1,455)
Deferred income taxes 46,789 42,962  
Derivative instruments (1,595) 7,653 4,747
Stock-based compensation expenses 3,656 9,970  
Debt discount amortization and other 1,561 470 95
Working capital and other changes:      
Change in accounts receivable (64,900) (44,450) (6,409)
Change in inventory (2,550) (498) (218)
Change in prepaid expenses (1,600) (356) (40)
Change in other current assets (491)      
Change in other assets (139) (164) (667)
Change in accounts payable and accrued liabilities 36,316 13,917 2,440
Change in other current liabilities 472    
Change in other liabilities 317 4 (39)
Net cash provided by operating activities 176,024 49,612 6,148
Cash flows from investing activities:      
Capital Expenditures (613,223) (226,544) (47,396)
Acquisition of oil and gas properties   (86,393) (35,215)
Derivative settlements (3,841) (120) 2,296
Purchases of short-term investments (184,907)      
Redemptions of short-term investments 164,913    
Advances to joint interest partners (497) 1,010 (2,331)
Advances from joint interest partners 5,963 2,512 383
Proceeds from equipment and property sales 2,202   1,507
Net cash used in investing activities (629,390) (309,535) (80,756)
Cash flows from financing activities:      
Proceeds from members' contributions     104,600
Proceeds from sale of common stock   399,669  
Proceeds from credit facility   72,000 22,000
Principal payments on credit facility   (107,000) (13,000)
Proceeds from issuance of senior notes 800,000      
Purchases of treasury stock (602)      
Debt issuance costs (18,680) (1,788)  
Net cash provided by financing activities 780,718 362,881 113,600
Increase in cash and cash equivalents 327,352 102,958 38,992
Cash and cash equivalents      
Beginning of period 143,520 40,562 1,570
End of period 470,872 143,520 40,562
Supplemental cash flow information:      
Cash interest paid, net of capitalized interest 13,748 1,002 674
Supplemental non-cash transactions:      
Change in accrued capital expenditures 58,205 35,181 4,134
Change in asset retirement obligations $ 5,434 $ 1,227 $ 2,156